Carbon dioxide foaming of glassy polymers

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Wessling, M. and Borneman, Z. and Boomgaard van den, Th. and Smolders, C.A. (1994) Carbon dioxide foaming of glassy polymers. Journal of Applied Polymer Science, 53 (11). pp. 1497-1512. ISSN 0021-8995

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Abstract:The mechanism of foaming a glassy polymer using sorbed carbon dioxide is studied in detail. A glassy polymer supersaturated with nitrogen forms a microcellular foam, if the polymer is quickly heated above its glass transition temperature. A glassy polymer supersaturated with CO2 forms this foam-like structure at much lower temperatures which indicates the Tg-depressing effect of CO2. Having this interpretation in mind, the overall sample morphology, i.e., a porous foam enclosed by dense outer skins, can be completely explained. The dense skins, however, are not homogeneous but show a nodular structure when analyzed by SEM and AFM. Foaming experiments with samples having a different thermal history suggest that the nucleation mechanism underlying the foaming process is heterogeneous in nature
Item Type:Article
Copyright:© 1994 John Wiley & Sons, Inc.
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/12726
Official URL:http://dx.doi.org/10.1002/app.1994.070531112
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